P&P 3-6

“She had no difficulty in believing that neither her virtue nor her understanding would preserve her from falling an easy prey” (212).

Lizzy is sharply criticizing Lydia here. It's harsh but true that Lydia was easy, and Lizzy is showing her superior sense by even noticing it. The other sisters, even Jane, would never have thought of these reasons as for why she would have run away.

"'No, Kitty, I have at least learnt to be cautious, and you will feel the effects of it '" (228).

Mr. Bennet is finally looking for his daughters' good. He becomes a father to them. It took Lydia's elopement to do this, which is a little pathetic, but he decides that it's best to watch over them like a real father should. However, it's a little late now, because one of his two "silly" daughters has disgraced themselves (unknowingly, but still). He doesn't really need to worry about the other three.